基于DEM和水文分析模块HEC-GeoHMS进行流域特征的分析，通过洼地填充、水流方向计算、水流累积量计算、水网提取，划分流域界线，生成了数字小流域。以苏南丘陵山区淳化流域为研究区进行了试验，结果表明：在受人类活动影响较小的山地丘陵地区,流域界线与分水岭吻合，提取的流域特征精度较高；而在地势平坦或人类活动干扰较大的地区，提取的结果与实际相差较大，流域界线需要人工进一步修正。从提取的效率和试验结果的精度两方面来看，基于DEM和水文分析模块HEC-GeoHMS的流域自动提取是切实可行的。
Abstract
The watershed characteristics were analyzed based on DEM and HEC for the major processes of lowland water infilling, calculation of water flow direction, water flow accumulation, and water network layout, finally the digital basin was generated. The Chunhua watershed in Jiangning, southern Jiangsu, was taken as a case study using the new tool set. The results of the study show: the watershed boundary line is almost identical to the ridge line in the mountain areas that are less impacted by human, but the result is much different from the actual watershed in the flat areas or areas that are much impacted by human. The watershed boundary line needs to be revised artificially further. In view of efficiency and precision, it is viable to use this new tool to extract watershed characteristics.
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基金
收稿日期：2008-10-13修回日期：2009-05-20基金项目：国家“十一五”科技支撑计划(2006BAD03A16)作者简介：林杰(1976—)，讲师，博士生，研究方向为3S在水土保持中的应用。Email:nfulinjie@163.com。引文格式：林杰, 张波,李海东,等. 基于HEC-GeoHMS和DEM的数字小流域划分[J]. 南京林业大学学报:自然科学版,2009,33(5):65-68.
